Guard for bolts of spring-locks



UNITED STATES- PATENT OFFICE.

GUARD FOR BOLTS'OF SPRING-LOCKS.

SPECIFICATION forming part of Letters Iatent No. 525,074, dated August 28, 1894.

Application filed October 11,1889. Serial No. 326654. (No model.)

panying drawings, which form part ofthis specification, in which Figure l isahorizontal section of one form of my guard, as applied to a door casing, showing a portion of a door provided with a spring lock having a guard flange formed thereon. Fig. 2 is an enlarged front elevation of my guard, combined with a striker for the lock. Fig. 3 is a like elevation of my guard, as used with a separate strikerand Figs. 4 and 5 are transverse sections of different forms of my guard.

A deficit common to all spring looks as a means for securing doors, is found in the easiness with which the lock bolt can be pushed back, by means of a knife or other thin instrument, while the door is locked'in the casing; which operation is most readily performed when the casing for the door is made I with a separate stop bead,'as shown in Fig. 1 so that a knife, or other instrument, can be inserted in the crack or joint between the stop bead and casing, and then pushed against the beveled end of the lock bolt so as to cause the same to recede into the lock, thereby leaving the door free to be swung open. When the door casing is made witha stop bead integral with the casing, the same operation can be effected by cutting away the stop bead to the level of the r'abbet, and then introducing an instrument in the manner above described and when double doors are used, by splitting or cutting away the strip, that covers the crack between the doors the bolt can be readily got at, and pushed back.

As represented in the drawings, A, designates my guard, which is shown in a preferred form in Figs 1, 2, 4 and 5 which consists of a single piece, which comprises the plate A pro vided with the bolt hole 1 standing flange 2 formed on one edge of said plate, and at an angle thereto, flange 6 formed to range in line with flange 2, but it is attached to opposite side of plate A, and so formed that. it can be sunk into casing below said plate. And transverse standing ribs 4 formed on the face of plate A, and at each end thereof. Standing flange 2 forms a break joint, which will prevent the introduction of a knife or other instrument at that point for 'the purpose of pushing in the lock bolt; and transverse standing ribs 4 will prevent an angle shaped thin instrument when introduced either above or below my guard from reaching the lock bolt. Said standing ribs may require the forming of corresponding grooves in the edge of the door,"to permit said ribs to lie therein when the door is closed. But when preferred said ribs may be omitted.

In Fig. 1 B is a door provided with a sprin lock, and O is the lock bolt of the latter. Said lock is preferably made with a flange 5 which is fitted to cover the crack between the edge ofthe door, and the corresponding face of the rabbet of the door casing, so as to prevent access to the lock bolt from that side of the door, flang) 5 may be made separate from'the loclifandattached to the inside of the door immediately over the lock.

In the modification shown in Fig. 3 the guard is made in the formof three sides of a rectangular frame, and it is designed for use with a striker D of the form commonly used with spring locks, said modification has all of the one shown in Figs. 1, 2, 4 and 5 excepting the'bolt hole, and the latter is formed in striker D.. It is not necessary to have plate A run continuously around the rectangular frame and if preferred'a portion may be omitted, leaving however lugs, or a sufficiency of same to properly support standing flanges 2 and 6 and ribs 4, and afiord sufficient fromthe outside of the door, through the joint' the point occupied by the look substantially as and for the purpose herein specified.

JOSHUA W. GRAY.

joints being fitted to cover the joint between WM. l-I. LOW, the edge of the door, and the door easing at S. B. BREWER. 

